JP5362470B2 - Route search device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce stress (frustration, fatigue, etc.) of a driver following a problematic preceding vehicle. <P>SOLUTION: A route search device for searching a traveling route for a vehicle is provided. The route search device includes: a route search means for detecting the current position of one's own vehicle, searching a first scheduled route from the current position to a destination position and displaying it; a preceding vehicle detection means for detecting the speed and type of a preceding vehicle; and a route comparison means for, when the speed of the preceding vehicle is a predetermined ratio of the limited speed of a traveling road or less, or when the preceding vehicle is a predetermined specific vehicle, acquiring a second scheduled route of the preceding vehicle and comparing the second scheduled route and the first scheduled route. When the corresponding ratio of the first and second scheduled routes is less than a predetermined value, the route search means calculates at least one of the distance and time to a branching point of the two scheduled routes, and displays it. When the ratio is not less than the predetermined value, the route search means searches a third scheduled route different from the first vehicle of the own vehicle and displays it. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a vehicle route search device, and more specifically to a route search device that searches for a vehicle travel route in order to reduce driver stress (irritability, fatigue, etc.) caused by a vehicle traveling in front of the vehicle. .

  Patent document 1 discloses the navigation system for moving bodies. This navigation system determines whether the preceding vehicle can be overtaken based on the map information and the route status information when the vehicle traveling in front (hereinafter referred to as “the preceding vehicle”) is slow. When it is possible to overtake, it will be indicated.

  Patent Document 2 discloses a navigation system. This navigation system guides an overtaking lane, an uphill lane, or a yuzuri lane when the preceding vehicle approaches a predetermined distance.

  Patent Document 3 discloses a driving support device. This device determines whether or not the surrounding vehicle is a vehicle requiring attention, and if it is a vehicle requiring attention, proposes a lane change or a change of the travel route.

  Patent Document 4 discloses a vehicle travel support system. This system issues an instruction to change lanes depending on whether or not there is traffic on the right turn waiting lane.

JP 2003-58999 A JP 2007-240338 A JP 2007-65998 A JP 2009-31142 A

  In the inventions described in Patent Documents 1 and 2, the influence of the preceding vehicle is avoided by changing the lane. Therefore, it is possible to avoid following the preceding vehicle only at a point where there is an overtaking lane where the lane can be changed. In addition, if the same preceding vehicle comes in front again, the following must be avoided again.

  In the invention described in Patent Document 3, if there is a vehicle requiring attention, a lane change or a travel route change is proposed to avoid it. However, it is not determined whether the proposed travel (change) route is appropriate from the viewpoint of travel time to the destination. Therefore, there is no guarantee that the driver is changing to a travel route that can avoid stress.

  In the invention described in Patent Document 4, a lane change instruction is issued depending on whether or not there is a traffic jam on the right turn waiting lane. Therefore, the traffic jam can be avoided only when there is a traffic jam due to the right turn waiting lane, and it is not effective when the vehicle follows a slow preceding vehicle.

  An object of the present invention is to reduce the driver's stress (irritability, tension, fatigue, etc.) when following a problematic preceding vehicle by avoiding the problems of the inventions described in Patent Documents 1 to 4. To do.

  It is an object of the present invention to guide an alternative route that is more appropriate for the driver when following a problematic preceding vehicle.

  The present invention provides a route search device that searches for a travel route of a vehicle. The route search device detects the current position of the host vehicle, searches for a first scheduled route from the current position to the target position, and the speed, type, and current of the preceding vehicle that runs in front of the host vehicle. Information acquisition means of the preceding vehicle for acquiring the second scheduled route from the position to the destination position, and when the speed of the preceding vehicle is equal to or less than a predetermined ratio of the speed limit of the road on which the vehicle is traveling, When the vehicle is a determined specific vehicle, route comparison means for comparing the second planned route with the first planned route is provided. The route search means calculates and presents at least one of the distance and time until the two planned routes branch when the matching ratio of the first and second planned routes is less than a predetermined value, If it is equal to or greater than the predetermined value, a third planned route different from the first planned route of the host vehicle is searched for and presented.

  According to the present invention, it is possible to grasp whether the preceding vehicle should be followed as it is, or how long the distance and time are to follow. In other words, it is possible to know when it will be released from the frustration of following, how long it will be necessary to continue attention in following. Also, if it is better to avoid following, it is possible to avoid the problematic front-running vehicle and head for the destination by re-searching for a new route and presenting an alternative route. Therefore, in any case, the driver's stress is reduced.

  According to one aspect of the present invention, the route search means calculates the planned travel time to the destination for each of the first and third planned routes, and the planned travel time in the third planned route is the first planned route. When it is shorter than the scheduled travel time at, the third scheduled route is presented.

  According to this aspect of the present invention, instead of simply overtaking or detouring the preceding vehicle, a countermeasure that is highly likely to reduce the driver's stress due to a reduction in travel time is presented. be able to.

  According to an aspect of the present invention, when there are a plurality of preceding vehicles, the route search means calculates the planned travel time to the destination for the first planned route, and calculates the second of the first planned routes. The planned travel time of the first planned route is increased according to the number of preceding vehicles that travel up to the branch with the planned route.

  According to this aspect of the present invention, when there are a plurality of preceding vehicles, it is possible to present a more reasonable planned traveling route in consideration of not only the planned traveling route itself but also the number of traveling vehicles.

  According to one aspect of the present invention, the route search means acquires a plurality of pieces of point information through which the preceding vehicle passes, and calculates a second scheduled route of the preceding vehicle from the point information.

  According to this aspect of the present invention, since the planned travel route and destination information of the preceding vehicle are not obtained from the communication route, it is possible to reduce the amount of communication or to ensure the privacy of the traveling of the preceding vehicle.

  According to one aspect of the present invention, the information acquisition means acquires the second scheduled route of the preceding vehicle at a predetermined time interval through inter-vehicle communication with the preceding vehicle or via communication with the server. At this time, the route search device can operate according to the acquisition of the second scheduled route at the predetermined timing.

  According to this aspect of the present invention, it is possible to receive timely proposals for following the preceding vehicle or changing to an alternative route without the driver having to operate it consciously.

  According to an aspect of the present invention, the information acquisition unit further includes a state detection unit that detects the state of the driver, and when the state detection unit determines that the driver's stress is large, the information acquisition unit Get planned route for.

  According to this aspect of the present invention, when the driver's stress due to the preceding vehicle increases, the second scheduled route of the preceding vehicle is acquired, and the follow-up vehicle is changed to the alternative route. By proposing this, it is possible to promote the reduction of the stress.

  According to one aspect of the present invention, the route search means presents at least one of the distance and time until the two planned routes branch when the traveling time from the departure point of the own vehicle exceeds a predetermined time. Instead, it presents at least one of a break or a parking place near the current location.

  According to this aspect of the present invention, the driver can be urged to reduce fatigue due to long-time driving.

  According to one aspect of the present invention, when the preceding vehicle is a predetermined specific vehicle, the route search means is configured to provide the first to the driver regardless of the coincidence ratio of the first and second scheduled routes. Propose a planned route different from the planned route.

  According to this aspect of the present invention, when a vehicle requiring attention is traveling ahead even if the arrival time is late, the driver arbitrarily designates an alternative route and travels avoiding the vehicle requiring attention. As a result, driving safety is enhanced, and at the same time, driver stress can be reduced.

It is a block diagram which shows the structure of the route search apparatus of this invention. It is a block diagram which shows the structure (function) of the control apparatus of FIG. It is an example of the control flow by the control apparatus of FIG. It is an example of the addition flow of the control flow of FIG. It is a figure which illustrates the 1st and 3rd route. It is a figure for demonstrating the cost of a driving | running route. It is a figure for estimating a driving route.

  Embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of a route search apparatus according to an embodiment of the present invention.

  The route search device 100 in the vehicle 1 includes a control device 10, a display unit 12, an operation unit 14, a voice output unit 16, an information storage unit 18, a sensor interface (I / F) 20, a communication interface (I / F) 22, A GPS receiver 24 is provided. The control device 10 is also called an electronic control unit (hereinafter referred to as “ECU”), and is a computer including a central processing unit (CPU) and a memory. The control device 10 executes various controls. Details of the control device 10 will be described later. The route search device 100 may be configured as a navigation device or a part thereof.

  The display unit 12 can be a display having a touch panel function. In that case, part of the operation of the operation unit 14 is performed on the touch panel of the display unit 12. The voice output unit 16 includes a speaker and transmits a guidance (instruction) from the control device 10 to the driver as voice. A voice input function via a microphone may be added to the voice output unit 16 in order to receive an instruction by the driver's voice.

  The information storage unit 18 is realized by an arbitrary storage unit (storage medium, HDD, etc.). The information storage unit 18 stores map data. The map data includes data necessary for drawing a map image on the display screen of the display unit 12. The map data further includes road data indicating information regarding the connection state of the road. The road data includes attribute information indicating attributes for each road. The attribute information includes road type, road shape, road gradient, number of lanes, road width, presence / absence of overtaking lane, legal speed, information on parking lot, and the like. The information storage unit 18 also functions as a memory that stores the latest road information received via the communication I / F 22.

  The sensor I / F 20 sends the image signal received from the camera 26 mounted on the vehicle 1 to the control device 10. The camera 26 is composed of, for example, a CCD camera, and takes an image of the front of the vehicle (front running vehicle, traffic jam, etc.). The sensor I / F 20 sends the sensor signal received from the biological state sensor 28 mounted on the vehicle 1 to the control device 10. The communication I / F 22 performs inter-vehicle communication 32 or network communication 34 via a wireless communication device 30 mounted on the vehicle 1. The network communication network 36 is connected to an information server 38 that holds various road information. Real-time traffic information can also be acquired from the information server 38. The traffic information includes, for example, information on traffic jams, construction work, traffic regulations, and the like.

  The GPS receiver 24 receives a GPS signal including positioning data from a plurality of GPS satellites in order to detect the absolute position of the vehicle from latitude and longitude information. The received GPS signal is sent to the control device 10. The control device 10 calculates the current position of the vehicle from the GPS signal. Note that the vehicle position or the gyro sensor signal may be received, and the current position of the vehicle may be calculated by another method (for example, an autonomous method).

  FIG. 2 is a block diagram showing a configuration (function) of the control device 10 of FIG. The function of each block is realized by a computer (CPU) included in the control device 10. Note that the configuration of the control device 10 may be incorporated in the navigation device. The control device 10 includes a route search unit 50, a preceding vehicle information acquisition unit 52, a route comparison unit 54, and a stress detection unit 56. The route search means 50 detects the current position of the host vehicle from the GPS signal received from the GPS receiver 24. The route search means 50 searches for a first planned route from the current position to the target position. Details of the route search means 50 will be described later.

  The information acquisition means 52 acquires the speed and type of the preceding vehicle and the second scheduled route from the current position to the target position. Information such as the speed of the preceding vehicle is acquired as image information from the camera 26 or communication information from the communication I / F 22. For example, the speed of the preceding vehicle is calculated from the positional relationship between the host vehicle and the preceding vehicle in the acquired image information, or directly acquired by communication with the preceding vehicle. Similarly, the type of the preceding vehicle is obtained by processing image information or directly obtained by communication with the preceding vehicle. The acquired image information (for example, license plate information) may be sent to the information server 38 via the communication I / F 22 to acquire the corresponding vehicle information.

  The types of preceding vehicles include not only literal types (trucks, buses, tank trucks, etc.) but also vehicles (specific vehicles) specified in advance as vehicles requiring attention. The vehicle requiring attention means a vehicle that requires special attention and consideration for protection when it becomes a preceding vehicle, and may increase the driver's stress (tension and fatigue). Specifically, vehicles with special obligations of legal obligations, such as beginner driver signs and elderly driver signs, vehicles with car rental number plates that are assumed to be unfamiliar with nearby roads, An oversized vehicle that significantly obstructs the field of view in front, or a vehicle equipped with dangerous goods such as powerful drugs or large luggage is applicable. The information on the vehicle requiring attention is preset in the control device 10 and stored in a memory, and can be updated and added in a timely manner by inter-vehicle communication or communication with the information server 38. The driver may arbitrarily select the information stored before traveling.

  When the speed of the preceding vehicle is slower than the speed limit of the road on which the vehicle is traveling by a predetermined rate or more, or when the preceding vehicle is a predetermined specific vehicle, the route comparison unit 54 Is compared with the second scheduled route of the preceding vehicle. Details of the route comparing means 54 will be described later.

  The stress detection means (state detection means) 56 receives a signal from the biological state sensor 28 that detects the state of the driver, and detects the degree of stress (irritation, tension, fatigue, etc.) of the driver. The biological state sensor 28 detects a biological state that can be used to determine the degree of stress on the driver. As the biological state sensor 28, for example, a sensor that detects a pulse or a sweat rate from a hand or a finger holding a handle, a sensor that detects the presence or absence of a heart rate or a heartbeat from a chest in contact with a seat belt, a head or face temperature, or a distribution thereof A temperature sensor that can detect

  The degree of stress is determined by whether or not the value indicating the detected biological condition exceeds a predetermined value or the value tends to increase. For example, when the pulse, the amount of sweat, the heart rate, and the head temperature exceed a predetermined value or increase at a predetermined change rate, it is determined that the stress has increased. As an additional method, a stress button may be provided in the operation unit 14 so that when the driver becomes irritated, the stress button can be pressed so that self-reporting can be performed to the control device 10.

  FIG. 3 is an example of a control flow by the control device 10 of FIG. The flow in FIG. 3 is executed by a CPU built in the control device 10.

  In step S102, the current position of the vehicle is detected, and a planned route (first planned route) from the current position to the target position is searched. The route search means 50 performs the search. The current position is calculated from the GPS signal. The target position is input from the operation unit 14 in advance. The first scheduled route from the current position to the destination position is determined using map data stored in the information storage unit 18. At that time, real-time traffic information acquired via the communication I / F 22 may be used. The first scheduled route is displayed on the map of the display unit 12 in a timely manner. The search for the planned route can use a method performed by a conventional navigation device.

  In step S104, the information acquisition means 52 acquires the speed and type of the preceding vehicle. The information acquisition method, the content of the type of the preceding vehicle, etc. are as already described in the description of the information acquisition means 52.

  In step S106, it is determined whether or not the speed of the preceding vehicle is equal to or less than a predetermined ratio of the speed limit (legal speed) of the traveling road. The speed limit is obtained from information stored in the information storage unit 18 or information acquired via the communication I / F 22. The predetermined ratio is determined assuming a speed at which the driver feels "too slow" and is frustrated. For example, 80% and 0.75 are determined. A plurality of ratios may be provided in advance so that the driver can select.

  If the speed of the preceding vehicle is equal to or less than a predetermined ratio of the speed limit of the road on which the vehicle is traveling, a planned traveling route (second scheduled route) of the preceding vehicle is acquired in step S108. The second scheduled route of the preceding vehicle is acquired by the information acquisition unit 52 through inter-vehicle communication or communication with the server, or is estimated from the scheduled traveling point of the preceding vehicle. The estimation of the planned route of the preceding vehicle will be described later.

  If the speed of the preceding vehicle is greater than a predetermined percentage of the speed limit of the road that is running, it is determined in step S110 whether or not the preceding vehicle is a predetermined specific vehicle. The determination is made based on the type of the preceding vehicle acquired by the information acquisition unit 52. The specific vehicle corresponds to, for example, the above-mentioned vehicle requiring attention. If the preceding vehicle is not a specific vehicle, the search ends (60). If the preceding vehicle is a specific vehicle, the process proceeds to step S108.

  Next, in step S112, the first scheduled route and the second scheduled route are compared. In the comparison, it is determined whether or not the ratio (hereinafter referred to as “match ratio”) at which the first and second scheduled routes match (overlap) is greater than or equal to a predetermined value. The predetermined value can be arbitrarily set, and is determined to be 70%, 0.75, for example. Note that the matching distance (m) may be used as a comparison object instead of the matching ratio. If the coincidence ratio is equal to or greater than the predetermined value, the process proceeds to step S114.

  In step S114, a travel route (third scheduled route) different from the first scheduled route is searched. The route search means 50 performs the search. The searched third scheduled route is displayed on the display unit 12. By selecting the third scheduled route, the driver is freed from frustration due to following a preceding vehicle that is a slow or sensitive vehicle.

  When the coincidence ratio in step S112 is less than the predetermined value, in step S116, at least one of the distance and time until the first and second scheduled routes branch is calculated. The distance to branch is a distance where two planned routes overlap. The calculated distance or time is displayed on the display unit 12 or transmitted from the audio output unit 16 as audio. Thus, the driver can grasp how long it is necessary to follow the preceding vehicle, which is a slow or sensitive vehicle, and to keep his / her attention.

  In step S114 of FIG. 3, steps S120 to S126 of FIG. 4 may be added before the searched third planned route is displayed on the display unit 12. In step S120, it is determined whether or not the travel distance La on the first scheduled route is greater than a predetermined distance Ld (La> Ld). Referring to FIG. 5, La is the distance from the point A to the point B on the route Ra. The point A and the point B can be arbitrarily determined as long as the first and second scheduled routes coincide with each other. For example, the point A can be the current point, and the point B can be the branch point of the first and second scheduled routes. The predetermined distance Ld can be arbitrarily determined. For example, when the driver follows a slow preceding vehicle, the predetermined distance Ld can be determined assuming a distance that can allow frustration. A plurality of distances may be provided in advance so that the driver can select.

  If La ≦ Ld, in step S126, as in step S112 of FIG. 3, at least one of the distance and time until the first and second scheduled routes branch is calculated (62). The calculated distance or time is displayed on the display unit 12 or transmitted from the audio output unit 16 as audio.

If La> Ld, it is determined in step S122 whether the following inequality expression (1) holds.
La / Vf> Lb / Vb (1)

  Vf is the speed of the preceding vehicle. Lb is the distance when traveling on the third scheduled route (alternative route) searched in step S114 of FIG. Referring now to FIG. 5, Lb is the distance from point A to point B on route Rb. Vb is the speed limit of the route Rb. La / Vf represents the estimated traveling time Ta when the distance La of the route Ra in FIG. 5 is traveled at the speed Vf of the preceding vehicle, in other words, when following the preceding vehicle at the speed Vf. Lb / Vb represents the scheduled traveling time Tb when traveling on the route Rb at the speed limit Vb. Therefore, the expression (1) can be expressed as Ta> Tb, and the planned traveling time Tb when traveling on the third planned route at the speed limit Vb follows the preceding vehicle at the speed Vf. It means whether it is shorter than the time Ta.

  In step S122, when calculating the scheduled traveling times Ta and Tb, the number of preceding vehicles may be reflected. For example, when there are a plurality of preceding vehicles traveling on the route Ra in FIG. 5, the planned traveling time Ta of the route Ra is increased according to the number of vehicles. Specifically, for example, a multiplier Lk corresponding to the number k is multiplied by the scheduled travel time Ta (Ta × Lk). This is because as the number of preceding vehicles increases, the actual travel time becomes longer, and the driver's frustration increases or the time that the frustration continues becomes longer.

  The reflection of the number of preceding vehicles can also be expressed using the concept of cost already introduced in the car navigation device. In a conventional car navigation apparatus, a route cost is calculated based on a distance or a travel time, and weighted by applying a coefficient according to a road condition (ease of driving, etc.). Also in this embodiment, this concept can be used to weight the cost of each route by applying a coefficient corresponding to the number of preceding vehicles. In this case, the cost may be calculated for each of a plurality of links (sections) constituting one route Ra, and the calculated costs may be added together. This is because the cost accuracy and reliability are improved.

  For example, as shown in FIG. 6, the cost is calculated for each link in the planned route P1 → P3 → P5 → A toward the destination A. Here, the cost is expressed in hours (minutes). The destination B in FIG. 6 is representatively described on the assumption that some of the plurality of preceding vehicles aim for a destination different from the destination A. In the link P1 → P3, the cost “15 minutes” calculated based on the distance and the speed limit is multiplied by a coefficient 1.6 corresponding to the number of vehicles on the link to obtain a weighted cost “24 minutes”. Similarly, the weighted costs “21 minutes” and “18 minutes” are obtained for the links P3 → P5 and P5 → A. By adding the weighted costs for each link, the cost “63 minutes” in the route P1 → P3 → P5 → A is obtained. On the other hand, in the example of FIG. 6, the cost “50 minutes” in the searched scheduled route (alternate route) P1 → P2 → P4 → A is obtained. Therefore, in the example of FIG. 6, the low cost alternative route P1 → P2 → P4 → A is selected. When there are a plurality of travel routes (alternative routes), the route with the lowest cost is selected. Thereby, it is possible to select an alternative route that is likely to be less frustrating. In order to increase the efficiency of route search, a route with high cost may be excluded from the search target in advance or the priority may be lowered.

  When Ta> Tb, in step S124, the third planned route obtained in step S114 of FIG. If Ta ≦ Tb, the process proceeds to step S126 (64), and the same process as step S116 in FIG. 3 is performed. That is, at least one of the distance and time until the first and second scheduled routes branch is presented.

  When steps S120 and S122 of FIG. 4 are employed, it is possible to determine whether to select an alternative route in consideration of the planned traveling time of the searched planned route (alternative route). Therefore, the possibility that the driver's stress is actually reduced when the alternative route is selected can be further increased.

  The estimation of the scheduled route for the preceding vehicle in step S108 in FIG. 3 will be described. FIG. 7 is a diagram for explaining the estimation of the planned route. It is assumed that there is a vehicle at P1 at this time. A is the destination of the vehicle, and B is the destination of the preceding vehicle. Each passing point Pn (n = 1 to 5) is set as a point connecting the links constituting the route. Routes connect points between points at the most reasonable (lowest) cost. If two points are specified, the route (link) with the most reasonable cost can be reproduced. Usually, a route search is performed by giving priority to a reasonable route, so that the route can be estimated using only two or more points.

  In the example of FIG. 7, P3 and P5 that are scheduled to pass through the preceding vehicle are first acquired. Assume that there are P3 and P5 at the planned passing points of the vehicle. The route search means 50 calculates the travel route of the preceding vehicle and the host vehicle from the acquired points (P3, P5). The route of the preceding vehicle is estimated as P1 → P3 → P5 → from the points (P3, P5). Since the traveling route of the own vehicle is also P1 → P3 → P5 → A, the preceding vehicle and the own vehicle are matched in the links P1 → P3 and P3 → P5.

  It is preferable not to display the point itself or the estimated route in FIG. 7 on the screen of the display unit 12. Even if the points are received, the route cannot be estimated unless the control device 10 performs the process. From the last point (P5 in FIG. 7) to the destination, in the case of vehicles with the same destination, there is a high possibility that a reasonable route will match, so it is necessary to send and receive route (link) information between them. There is no. In this route estimation, the planned travel route and destination information of the preceding vehicle are not obtained from the communication route, so it is possible to reduce the amount of communication or protect the privacy of the traveling of the preceding vehicle.

  In step S108 of FIG. 3, the information acquisition means 52 acquires the second scheduled route of the preceding vehicle at a predetermined time interval through inter-vehicle communication with the preceding vehicle or via communication with the server. Also good. Thereby, in the control apparatus 10, a series of operation | movement (steps S102-S116) can be performed according to acquisition of the 2nd scheduled route in the said predetermined time interval. As a result, the driver can receive a proposal for following the preceding vehicle or changing to an alternative route in a timely manner without conscious operation.

  Furthermore, the information acquisition means 52 may acquire the 2nd scheduled route | route of a preceding vehicle, when the information that the driver | operator's stress level is large is acquired from the stress detection means 56 (FIG. 2). Or when a driver | operator presses the stress button of the operation part 14 mentioned above, you may acquire the 2nd scheduled route of a preceding vehicle similarly. Thereby, in control device 10, a series of operation (Steps S102-S116) can be performed according to acquisition of the 2nd schedule route after stress detection. As a result, when the driver's stress due to the preceding vehicle increases, it is possible to promote the reduction of the stress by suggesting following the preceding vehicle or changing to an alternative route.

  In the series of flows in FIG. 3, it may be added that the route search means 50 acquires the traveling time from the departure point of the own vehicle and determines whether or not the traveling time exceeds a predetermined time. If the travel time exceeds the predetermined time, instead of presenting either one of the distance and time until the planned route branches in step S116, at least one of a rest and a parking place near the current point is possible. Have them present one or the other. The predetermined time can be set arbitrarily, but it may be set to, for example, 10 minutes or 60 minutes in consideration of the necessity of accumulation of driver fatigue, meals, water supply, toilet breaks, and the like. As a result, the driver can be urged to reduce fatigue due to long-time driving.

  Furthermore, when it is determined in step S110 of FIG. 3 that the preceding vehicle is a specific vehicle, the first schedule is given to the driver regardless of the coincidence ratio of the first and second scheduled routes in step S112. A planned route different from the route may be proposed. The proposal is notified as sound on the screen of the display unit 12 or from the sound output unit 16. As a result, when the vehicle requiring attention is traveling ahead, the driver can arbitrarily specify an alternative route and travel while avoiding the vehicle requiring attention. Stress can also be reduced.

  The above-described embodiment is an example, and the present invention is not limited to this. Various modifications are possible without departing from the spirit of the present invention. The present invention is basically applicable to any vehicle that can perform wireless communication between vehicles or an information server.

1, 2, 3 Vehicle 10 Control device 12, 42 Display unit 14 Operation unit 16 Audio output unit 18 Information storage unit 20 Sensor I / F
22 Communication I / F
Reference Signs List 24 GPS receiver 26 camera 28 biological state sensor 30 wireless communication device 36 network communication network 38 information server 100 route search device

Claims (7)

A route search device for searching a travel route of a vehicle,
Route search means for detecting the current position of the vehicle and searching for a first planned route from the current position to the target position;
The information acquisition means of the preceding vehicle for acquiring the second scheduled route from the current position to the target position, the speed and type of the preceding vehicle running in front of the own vehicle;
When the speed of the preceding vehicle is equal to or less than a predetermined ratio of the speed limit of the road on which the vehicle is traveling, or when the preceding vehicle is a predetermined specific vehicle, the second scheduled route and the first scheduled route And a route comparison means for comparing
The route search means has a matching ratio between the first and second planned routes.
(I) If it is less than the predetermined value, calculate and present at least one of the distance and time until the two planned routes branch,
(Ii) A route search device that searches and presents a third planned route that is different from the first planned route of the vehicle when the vehicle is equal to or greater than a predetermined value.   The route search means calculates a planned travel time to the destination for each of the first and third planned routes, and a planned travel time on the third planned route is a planned travel on the first planned route. The route search device according to claim 1, wherein the third scheduled route is presented when the time is shorter than the time.   When there are a plurality of preceding vehicles, the route search means calculates the planned traveling time to the destination for the first planned route, and the second planned route among the first planned routes. The route search device according to claim 2, wherein the planned traveling time of the first planned route is increased in accordance with the number of the preceding vehicles traveling up to the branch.   4. The route search unit according to claim 1, wherein the route search unit acquires a plurality of pieces of point information through which the preceding vehicle passes and calculates a second scheduled route of the preceding vehicle from the point information. Route search device.   The information acquisition means acquires the second scheduled route of the preceding vehicle at a predetermined time interval by inter-vehicle communication with the preceding vehicle or via communication with a server. The route search apparatus in any one.   Furthermore, when the state detection means which detects a driver | operator's state is determined and the said state detection means determines with a driver | operator's stress being large, the said information acquisition means acquires the 2nd scheduled route of the said preceding vehicle. The route search device according to claim 1.   When the traveling time from the departure point of the own vehicle exceeds a predetermined time, the route search means takes a rest instead of presenting at least one of the distance and time until the two planned routes branch. The route search device according to any one of claims 1 to 6, wherein at least one of a location and a location where parking is possible near the current location is presented.

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